Summary of Significant Accounting Policies (Summary of Activity Recorded within the Allowance for Doubtful Accounts) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 6,960	$ 6,434	$ 5,272
Bad debt expense	2,862	1,150	1,253
Accounts written off and other adjustments	(3,492)	(624)	(91)
Ending balance	$ 6,330	$ 6,960	$ 6,434